1. Department of Anatomo-Pathology, University of Montreal Heath Care Center, Montreal, Quebec, Canada
2. Hematology-Oncology Division, Department of Pediatrics, Ste-Justine Hospital, Montreal, Quebec, Canada
3. Department of Hematoly-Oncology, Notre-Dame Hospital, Montreal, Quebec, Canada
4. Department of Pathology, Ste-Justine Hospital, Montreal, Quebec, Canada